Automatic draft-regulating mechanism.



No.7l4,259. Patented Nov. 25, I902.

I. P. TAGGART.

"AUTOMATIC DRAFT REGULATING MECHANISM.

(Application filed Mar. 3. 1902.)

(Ho mum.)

To DRAFT 000R To DAMPER WATER CONNECTION TO BOILER WATER co/vmzc TION T0 Boll-ER m: "bums BETERS co, mom-mun. wnsmwuron. n. c.

fore automatic mechanisms have been del water was used to expand a confined expan- UNITED STATES ISAAC TAGGART, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO ANNA E. TAGGAR'I, OF PHILADELPHIA, PENNSYLVANIA.

AUTOMATIC DRAFT-REGULATING MECHANISM SPECIFICATION forming part of Letters Patent No. '71&,259, dated November 25, 1902.

Application filed March 3, 1902.

To all whom it may concern.-

Be it known that LISAAO P.TAGGART, a citi zen of the United States, residing at Philadelphia, county of Philadelphia, State of Penn-. sylvania, have invented certain new and useful Improvements in Automatic Draft-Regu-. lating Mechanism, of which the following is a specification.

My invention relates to an improved auto lnat-ic draft-regulating mechanism designed particularly for hot-water heaters. Heretovised for this purpose in which the heated sible medium, and thereby operate a lever mechanism connected to the draft-closures.

My improvements consist, mainly, in confining the expansible medium, preferably air, in vessels adapted to float in a circulatingchamber for the heated water at varying heights therein determined by the temperature of the water and the varying bouyancy of the vessels caused by the expansion and contraction of the confined expansible medium, as air, the Weights of the connected moving parts being properly balanced by the normal buoyancy of the movable air vessels and by a suitable counterweight, as required.

The invention is fully described in connection with the accompanying drawing and is particularly pointed out in the subjoined claim.

The drawing is a sectional elevation of a simple form of apparatus embodying my invention.

A represents a circulating-tank, which is connected atpoints a and a, respectively, to the hot-water heater, so as to secure a circulation through said tank which will cause a variation of temperature in the latter corresponding with that in the heater.

B B represent similar expansible air-chambers, any desired number of which may be employed. The displacement of these chamhers is greater than their. weight, so as to cause them to float in the water contained in the tank, their bouyancy, however, varying with the expansion or contraction of the air confined in them, due to the varying temperature of the water surrounding them and the corresponding spreading or closing of the filerial No. 96,356. No model.)

yielding walls b and b of each chamber. These walls may be made of thin circularlycorrugated metal to permit of considerable enlargement of the chambers under pressure of the heated air inclosed. These buoyant chambers B B are in the connected apparatus pressed down somewhat in the watertank by the unbalanced weight of the lever mechanism connecting them with the damper and draft-doorfor instance, of the heater to which the apparatus is attached-a rod 0, which extends through an opening in the top of the tank, being pivoted to a lever D, forming part of said connecting mechanism, as shown, and bearing upon said chambers, so as to rise and fall with the latter. This lever D is fulcrumed at d to a fixed support and is operatively connected by any suitable means to the draft-closures of the heater, one end being preferably. connected to the damper and the other to the draft-door. An adj ustable weighttl/V is arranged to slide upon this lever and is adapted, in connection with the buoyancy of the air chambers, to so balance the weight of the parts as to allow said air-chambers to float in the expansiontank, and by the variation in their buoyancy, due to different temperatures of the water therein, as stated, to correspondingly vary the balance and cause an upward or downward movement of the lever D, as required to restore the predetermined operating temperature of the water. Thus if the temperature of the water falls below that desired the air-chambers will be contracted, and their buoyancy being thus reduced they will sink so as to allow a corresponding movement of the lever D, producing an increase of draft, and when the resulting increase of heat in the furnace has raised the temperature of the water the buoyancy of the air-chambers will be increased and a reverse movement of the balanced parts will follow, reducingthe furnace-draft. Thus the latteris automatically adjusted with nicety and certainty, the floating balance in whichthe parts are maintained insuring a quick response to very slight changes of temperature in the water and the movement of the latter, due to the circulation through the tank, keeping the floating parts constantly free and ready to adjust themselves in accordance with the Varying buoyancy. At the same time the apparatus is very simple in construction and operation, easily kept in order, and readily adjusted to maintain any desired temperature.

It is evident that the apparatus-specifically shown and described may be readily modilied Without departing from the spirit of my invention, and I do not, therefore, desire to limit myself to this particular construction; but

That I claim is An automatic draft-regulator mechanism for hot-water heaters comprising a hot-watercirculating tank, one or more expansible sealed chambers. adapted to freely float in said tank and containing an expansible medinm, and a balanced draft-lever mechanism connected to said floating chamber or' chambers and adapted to, be operated by the varying buoyancy thereof due to expansion and contraction of the chamber with the contained medium, substantially as set forth.

In testimony whereof I affix my signature 25 

